14 The submission is rejected.
15 The Tribunal was required, in reaching its decision, to have regard only to the matters in s 34(1A)(a), (b) and (c), there being no matters prescribed for the purposes of (d) of that sub-section. By force of s 34(1A)(c) and (1B), the Tribunal had to determine, among other things, what was the impairment that was a cause of Mr House's invalidity or incapacity by reason of which he was retired from the army. It identified that, correctly, as "alcoholism and alcoholic liver disease". However, it said: "With the passage of time and the benefit of hindsight, we are left in a difficult position because we doubt that is a correct diagnosis of the applicant's medical condition at the time of discharge from the army and thereafter." But the Tribunal correctly acknowledged that, despite this doubt, it was bound to deal with the case on the basis that Mr House was retired because of "alcoholism and alcoholic liver disease".
16 Additionally, Mr House contended in the Tribunal, but not in the proceedings before the Authority, that there should be taken into account in his favour that he was also suffering post traumatic stress disorder. His contention in oral submissions to the Tribunal was that this was an impairment which the Tribunal was required by reason of s 34(1A)(c) and (1B)(b) to taken into account in his favour in its review of the Authority's reclassification exercise. The Tribunal evaluated the conflicting medical and other evidence and explained why it considered that the information provided by Mr House upon which Dr Crompton, who had diagnosed chronic post traumatic stress disorder, was too unreliable to justify that diagnosis. The Tribunal also expressly accepted the evidence of Dr Reddan to the effect that Mr House was not a post traumatic stress disorder sufferer and also referred, with obvious approval, to the other medical evidence supporting Dr Reddan's view and conflicting with Dr Crompton's diagnosis.
17 The Tribunal was also required, by s 34(1A)(c), to determine the degree to which the condition of "alcoholism and alcoholic liver disease" for which he was retired from the army diminished his capacity to undertake the kinds of civil employment "referred to in paragraph (b)" of that subsection. The Tribunal, in par 48, expressly adverted to this issue. It identified these employments by referring to the determination made by the Authority in its decision of December 1999. The Authority had given detailed consideration to identifying the various kinds of civil employment which Mr House could, given his range of skills and experience, reasonably undertake. The Authority concluded that there were six kinds of such civil employment, rejecting Mr House's claim that there were a couple of other classes of employment that he was hampered or prevented from engaging in by reason of his impairment. The Tribunal concluded: "that the respondent [Authority's] determination as to relevant kinds of employment set out in para 2 above is appropriate and reasonable in the circumstances". It added some explanatory comment.
18 In determining the degree to which his retirement impairment had diminished his capacity to undertake these six kinds of civil employment, the Tribunal evaluated and made findings on both the applicant's own evidence and the medical evidence. It made findings as to his long history of continuous employment subsequent to his discharge and it held that, though his abuse of alcohol "must have had an effect on his capacity as an employee", it was not such as to make him unemployable. It found "that the abuse is controlled so that there is no undue adverse influence on the applicant's employment performance". It referred to other aspects of his evidence, including what he said about his ability to control his drinking during the working week, and found that Mr House "is able to maintain remunerative employment while that is his inclination and [while] he controls his substance abuse for this purpose".
19 The Tribunal then turned to its consideration of the medical evidence relevant to the issue of the extent to which his alcoholism had diminished his capacity to undertake civil employment. It gave detailed consideration to that body of evidence. It expressly accepted Dr Stevenson's assessment of his having a 30% incapacity in relation to the six kinds of civil employment referred to in the Authority's decision. The derivation of this assessment was explained by Dr Stevenson in his report of 4 November 1999. Dr Stevenson expressed the opinion that, "based on Mr House's account of his alcohol intake", he was 45% incapacitated for each of the six kinds of civil employment referred to in the Authority's decision of December 1999. He also said that the 45% incapacity assessment, based as it was on Mr House's "purely subjective account" of the impact of his alcoholism on him makes it "more appropriate to move [to] an estimate based on more objective measures". Dr Stevenson's report listed three objective measures, including clinical and pathology tests showing that his liver function was then "pristine", his continuing ability to hold employment and his good neurological status as evidenced by such things as his excellent capacity to argue a complex legal case. He reported that these objective measures "would indicate that a more precise set of figures, based on objective criteria, would be" 10% for each of the six kinds of employment. His report concludes with the suggestion that "perhaps as an interim measure", the average of 27.5% between what he referred to as the assessments based on the subjective and the objective criteria rounded off to 30% overall should be adopted. He explained what he meant by doing this "as an interim measure" by recommending that Mr House be reviewed in five years or so with a view to making an assessment based on purely objective criteria.
20 After its evaluation of all the relevant evidence, the Tribunal expressed its ultimate conclusion in this way: